Aramid fibre

The word ‘aramid’ is a composite of the words ‘aromatic’ and ‘polyamide’ and is also known by the protected brand names Twaron®, Nomex® and Kevlar®. The chemical name is para-phenylene terephthalamide or PPD-T. Aramid fibres are made up of yellow filaments with a diameter of around ten microns that are assembled into a thread. They feature a smooth surface and round cross-section. Although there are three main families of polyamides, para-aramid, para-aramid co-polymers and meta-aramid, at STW we only process para-aramid. Aramids are characterised by high thermal and chemical resistance, strength and elasticity as well as good flame resistance and dimensional stability.

Pros and cons
Aramid fibre Properties


  • Very high tensile strength (similar to that of steel)
  • Tensile modulus that can be up to two times higher than glass
  • High modulus of elasticity
  • Greater damping properties than glass and carbon fibre
  • High temperature resistance
  • Flame retardant, does not melt
  • Good fatigue strength
  • High toughness and therefore excellent resistance to crack propagation
  • High elongation at break
  • Wear-resistant
  • Good chemical resistance to solvents and lubricants


  • Not UV-resistant
  • Poor matrix adhesion due to hygroscopicity
  • Non-conductive
  • Aramids are attacked by very strong acids and alkalis

Aramid fibre
Manufacturing process

The para-aramid (also called para-phenylenediamine) is allowed to react with terephthaloyl dichloride (TDC). The resulting PPD-T is dissolved in a solvent. Due to its high concentration and anisotropic character, sulphuric acid is a very good solvent. This polymer is extruded and spun in a spinneret in
the standard classic wet spinning process. The resulting threads are cooled in a stream of air, then washed, dried and wound onto spools.

Aramid fibre Programme

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Order our Aramid fibre Sample box

Contact our fibre experts and discover our extensive STW sample box with numerous raw material samples, personally tailored to your needs and requirements.

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technology and
quality of the fibre

State-of-the-art laboratory facilities, quality management according to ISO 9001:2015, energy management according to ISO 50001:2018 and last but not least the high demands on our own work ensure the high quality standards of our Aramid fibre. See for yourself.

If you want to know more about the technology and quality of our Aramid fibre If you want to know, just get in touch with us. We would be happy to advise you comprehensively and help you with our know-how.

You are looking for the perfect Aramid fibre for your application or have an exact requirement profile, which the used Aramid fibre must fulfill?

Then you are exactly right, as a technology leader in the field of fibre development and production, we offer you individual solutions and manufacturing processes that ensure constant and reproducible fibre quality.



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